INKJET RECORDING INK, INK CARTRIDGE, INKJET RECORDING METHOD, INKJET RECORDING DEVICE AND INK RECORDED MATTER

摘要

An inkjet recording ink, including: water; a water-soluble organic solvent; a pigment; and a phosphate group-containing copolymer, wherein the phosphate group-containing copolymer contains a structural unit represented by the following General Formula (1) and a structural unit represented by the following General Formula (2): where R1 denotes a hydrogen atom or a methyl group; M+ denotes an alkali metal ion, an organic amine ion, or a hydrogen ion; half or more of M+ in the copolymer is the alkali metal ion or the organic amine ion, the remainder of M+ is the hydrogen ion; n and m each denote an integer of 0 to 6, provided that both of n and m are not 0; and a block of (C2H4O) and a block of (C3H6O) may be exchanged with each other, where R2 denotes a hydrogen atom or a methyl group.